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Securities, Held to Maturity (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Held-to-maturity securities, fair value to amortized cost [Abstract]          
Amortized cost $ 683,103   $ 683,103   $ 616,560
Unrealized gains 12,260   12,260   21,942
Unrealized losses 6,234   6,234   1,675
Estimated fair value 689,129   689,129   636,827
Allowance for credit losses on HTM securities 0   0   0
Gains from calls on HTM securities 14 $ 11 29 $ 15  
Held-to-maturity securities sold, amortized cost 0   0 1,000  
Held-to-maturity securities sold, realized loss       $ 1  
Amortized costs of securities available for sale and held to maturity pledged 1,600,000   1,600,000   1,400,000
Amortized costs of securities AFS and HTM pledged as collateral for repurchase agreements 149,200   149,200   305,200
Federal Agency [Member]          
Held-to-maturity securities, fair value to amortized cost [Abstract]          
Amortized cost 100,000   100,000   100,000
Unrealized gains 0   0   0
Unrealized losses 3,821   3,821   1,658
Estimated fair value 96,179   96,179   98,342
Mortgage-Backed, Government Sponsored Enterprises [Member]          
Held-to-maturity securities, fair value to amortized cost [Abstract]          
Amortized cost 121,040   121,040   107,914
Unrealized gains 2,851   2,851   4,583
Unrealized losses 568   568   0
Estimated fair value 123,323   123,323   112,497
Mortgage-Backed, U.S. Government Agency Securities [Member]          
Held-to-maturity securities, fair value to amortized cost [Abstract]          
Amortized cost 9,121   9,121   11,533
Unrealized gains 659   659   979
Unrealized losses 0   0   0
Estimated fair value 9,780   9,780   12,512
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]          
Held-to-maturity securities, fair value to amortized cost [Abstract]          
Amortized cost 75,852   75,852   103,105
Unrealized gains 3,050   3,050   4,477
Unrealized losses 0   0   0
Estimated fair value 78,902   78,902   107,582
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member]          
Held-to-maturity securities, fair value to amortized cost [Abstract]          
Amortized cost 54,587   54,587   79,145
Unrealized gains 679   679   3,950
Unrealized losses 341   341   0
Estimated fair value 54,925   54,925   83,095
State & Municipal [Member]          
Held-to-maturity securities, fair value to amortized cost [Abstract]          
Amortized cost 322,503   322,503   214,863
Unrealized gains 5,021   5,021   7,953
Unrealized losses 1,504   1,504   17
Estimated fair value $ 326,020   $ 326,020   $ 222,799